Place vegetables on the rack of the grill directly over medium heat. Grill until tender, turning occasionally. (Allow 8 to 12 minutes for eggplant and sweet peppers and 12 to 14 minutes for onion.) Remove vegetables from grill; cool until easy to handle.

Meanwhile, wrap tortillas in foil. Place tortillas on rack of the grill directly over medium heat. Grill about 8 minutes or until heated through.

From the Test Kitchen

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To secure onion slices during grilling, soak short wooden skewers in water for 20 minutes. Insert skewers into onion slices from the sides to the centers. The skewers will hold the rings together during grilling. Remove skewers after grilling, and separate onion slices into rings.